Confusing as hell

The lastest ch are confusing like she liked the brother and thought that she slept with the brother but it was ml, after that ml pretended to be the brother to reject her, then shouldn't she hate the brother instead of the ml cuz he used his brother identify that night, like what's with the drama in the first few chapters or did she know?

But that don't make sense too cuz she texted the brother to meet up with her and confess her love to the brother and that's how the story start

Oh well I guess I'll never know